<template>
    <el-menu default-active="/" class="el-menu-vertical-demo" background-color="#545c64" text-color="#fff"
        active-text-color="#ffd04b" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
        <h3>{{ isCollapse?'后台': '通用后台管理系统' }} </h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.path">
            <i :class='`el-icon-${item.icon}`'></i>
            <span slot="title">{{ item.label }}</span>
        </el-menu-item>
        <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
            <template slot="title">
                <i :class="`el-icon-${item.icon}`"></i>
                <span slot="title">{{ item.label }}</span>
            </template>
            <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
                <el-menu-item @click="clickMenu(subItem)" :index="subItem.path">{{ subItem.label }}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
    </el-menu>
</template>

<script>
import Cookie from 'js-cookie';
export default {
    data() {
        return {

        };
    },
    methods: {
        handleOpen(key, keyPath) {
            console.log(key, keyPath);
        },
        handleClose(key, keyPath) {
            console.log(key, keyPath);
        },
        /* 点击菜单 */
        clickMenu(item) {
            this.$router.push(item.path)
            this.$store.commit('selectMenu', item)
        }
    },
    computed: {
        /* 没有子菜单的导航 */
        noChildren() {
            return this.menuData.filter(item => !item.children)
        },
        /* 有子菜单的导航 */
        hasChildren() {
            return this.menuData.filter(item => item.children)
        },
        isCollapse() {
            return this.$store.state.tab.isCollapse
        },
        menuData() {
            return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
        }
    },
}
</script>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 100%;
    white-space: nowrap;
}

.el-menu {
    height: 100vh;
    border: none;

    h3 {
        color: #fff;
        text-align: center;
        line-height: 48px;
        font-size: 16px;
    }
}
</style>